HEAVY-DUTY ROTAX V-TWIN ENGINES: The Defender MAX XT package offers two very capable true-work powerplant options. The 72-hp Rotax HD10 V-Twin is specifically tuned for serious work but also offers 61 lb-ft torque and peak torque at lower RPM for optimal delivery for recreational use. The work-focused Rotax HD8 V-Twin delivers 50 hp and 50 lb-ft torque for tough tasks.